By X--ray mass screening of a total of1,134,532participants during a six year period from April,1980to March,1986,385 were suspected of lung cancer.One hundred and thirty--five cases out of these 385 cases were diagnosed as lung cancer,and 67 cases underwent thoracotomy.To evaluate the efficacy of X--ray mass screening,we studied the histological type,clinical stage,tumor size,location,and the period from screening to resection. Many of these resected cases were peripherally situated

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... oma in early clinical stage.The interval from screening to thoracotomy,ranged from 17 to 165 days(average 52.1 days),and in17cases(28.3%),it was30days or less.However,there were 17 cases in which the interval was more than 60 days.The reason for such a delay was the difficulty in diagnosis.If good communication and cooperation were established between medical staff and patients,it seems possible to resect of lung cancer shortly after the detection.